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Oxygen-Vacancy-Induced Orbital Reconstruction of Ti Ions at the Interface of LaAlO3/SrTiO3 Heterostructures: A Resonant Soft-X-Ray Scattering Study
- Authors
- Park, J.; Cho, B-G; Kim, K. D.; Koo, J.; Jang, H.; Ko, K-T; Park, J-H; Lee, K-B; Kim, J-Y; Lee, D. R.; Burns, C. A.; Seo, S. S. A.; Lee, H. N.
- Issue Date
- 3-Jan-2013
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW LETTERS, v.110, no.1
- Journal Title
- PHYSICAL REVIEW LETTERS
- Volume
- 110
- Number
- 1
- ISSN
- 0031-9007
- Abstract
- Resonant soft-x-ray scattering measurements have been performed to investigate interface electronic structures of (LaAlO3/SrTiO3) superlattices. Resonant scattering intensities at superlattice reflections show clear evidence of degeneracy lifting in t(2g) states of interface Ti ions. Polarization dependence of intensities indicates the energy of d(xy) states is lower by similar to 1 eV than two other t(2g) states. The energy splitting is insensitive to epitaxial strain. The orbital reconstruction is induced by oxygen vacancies and confined to the interface within two unit cells, indicating charge compensation at the polar interfaces. DOI: 10.1103/PhysRevLett.110.017401
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Related Researcher
- Lee, Dong Ryeol
- College of Natural Sciences (Department of Physics)